<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    let obj = {
      uname: 'xiaodu',
      age: 24,
      gender: 'man',
      sing: function () {
        console.log('我会唱歌');
      }
    }
    console.log(obj.age)
    // console.log(obj['uname'])
    let abc = 'gender'
    console.log(obj[abc])
  </script>
</body>

</html>